How do I grade Jumbo cards with psa?

The quality on the Charizard jumbos has always been poor imo. Most I’ve seen have a decent bit of edgewear out of the package. I would say jumbos are graded more leniently than regular sized cards. With that being said, most jumbo zards get 9s at best. On the other hand, I opened a few cases of Mega Powers and the Mega Lucarios came out perfectly.